{
  "manageEntity": {
    "action": "Save",
    "entityId": "1457266696",
    "entityType": "Track",
    "nonce": "0x31b2d5c0f74eccc3091257e496b44c9c1a96314e6339690b479389bae227e091",
    "signature": "0xaacb28e44d177703a571422cb72f99493bf6a3dab2b87262a983f42e298007ec2afdaf074680da548f8d415e2351b7a1b8e5770ccdd46465687fbbb7b425198f1c",
    "signer": "0x12705C8Fe8CE886CeFEFa0d4d46E906f2c35C954",
    "userId": "477934274"
  }
}